Time-setter for an electronic timepiece

ABSTRACT

An electronic watch comprising a motor for converting electrical energy into mechanical rotational movement, an actuating means operable from the outside of the casing of the watch, and an arbor means for the hand of the watch. A gear train couples the motor to the arbor means and a cam means is operatively connected to the actuation means and the watch hands. The cam means are controlled by the operation of the actuation means for setting at least one of the hands of the watch to a reference position whereby the watch may be set by merely operating the actuation means.

United States Patent [191 Noguchi TlME-SETIER FOR AN ELECTRONICTIMEPIECE [75] lnventor: Kazuo Noguchi, Tokyo, Japan [73] Assignee:Citizen Watch Company Limited,

Tokyo, Japan [22] Filed: Dec. 12, 1972 [2]] Appl. No.: 314,406

[30] Foreign Application Priority Data Dec. 13, 1971 Japan 46-100825[52] US. Cl. 58/85.5, 58/34 [51] Int. Cl. G04b 27/00 [58] Field ofSearch 58/23 R, 23 D, 34, 37, 58/855 [56] References Cited UNITED STATESPATENTS 452,424 5/1891 Church 58/34 3,059,412 10/1962 Epperlein 58/85.5X 3,262,259 7/1966 Bennett et a. 58/85.5

[ June 18, 1974 3,597,915 8/1971 Aizawa 58/23 D 3,665,698 5/1972 Dome58/85.5 FOREIGN PATENTS 0R APPLICATIONS 734,618 8/1955 Great Britain58/85.5

1,018,643 1/1966 Great Britain 58/85.5

Primary Examiner-Lawrence R. Franklin Attorney, Agent, orFirm-Armstrong, Nikaido & Wegner [57] ABSTRACT An electronic watchcomprising a motor for converting electrical energy into mechanicalrotational movement, an actuating means operable from the outside of thecasing of the watch, and an arbor means for the hand of the watch. Agear train couples the motor to the arbor means and a cam means isoperatively connected to the actuation means and the watch hands. Thecam means are controlled by the operation of the actuation means forsetting at least one of the hands of the watch to a reference positionwhereby the watch may be set by merely operating the actuation means.

4 Claims, 6 Drawing Figures PATENTEDJuu 1 8 1914 saw 2 of 3 '1TIME-SETTER FOR AN'EILECTRONIC TIMEPIECE This invention relates toimprovements to electronic watches, and more specifically, it relates toimproved correction mechanisms adapted for correction of timeindicating-hands for keeping desired correct time display.

In the case of conventional mechanical or electronic watches, clutchmeans, preferably of the frictional type, must be provided in the geartrain arranged between time indicating hand arbor and the escapement,for release of excess torque at thisclutch means when it develops as thetime-setting operation of a heart cam member or the like. However, theprovision of such clutch means inserted in the gear train will make thelatter into a highly complicated design and arrangement, an increasedthickness of the timepiece movement and a substantial difficulty in thearrangement of such gear train.

The main object of the present invention is to provide an improvedtime-indicator correction mechanism, devoid of such additionalmechanical clutch means in the gear train, for obviating the abovementioned conventional drawbacks.

For attaining such object as above, an electronic watch is providedwhich includes means for conversion of electrical energy into acorresponding mechanical rotational movement, and a time-display handcorrection cam means controllable by manipulation of an operatingmember, preferably a push button manipulatable from the outside of thewatch movement. A gear train extends between said motion conversionmeans and an arbor for said time-display hand, thus excess torquedeveloped by the correction operation of said correcting cam is releasedthrough said motion conversion means per se.

These and further objects, features and advantages of the invention willbecome more apparent as the description by by reference to theaccompanying drawings.

In the drawings:

FIG. 1 is a schematic plan view of the first embodiment of the inventionin its regular operating state.

FIG. 2 is a similar view to FIG. I, wherein a timesetting button of thetimepiece has been pushed in for adjusting the time-indicating hands toa desired hour time.

FIG. 3 is a part of the timepiece movement shown in FIGS. 1 2, whereinthe operation is such that a certain selected minute time has been set.

FIG. 4 is a sectional view taken along a broken section line IV IV shownin FIG. 1.

FIG. 5 is an enlarged and somewhat modified part of FIG. 4, constitutingthe second embodiment of the invention.

FIG. 6 is a similar view to FIG. 1, showing the third embodiment of theinvention.

Referring now to the accompanying drawings, illustrative of threepreferred embodiments of the invention, the invention will be describedin detail hereinbelow and by way of example only.

In FIGS. 1 4, numeral 1 represents only partially a base plate, such aspillar plate, on which a motiontransmitting lever 2 is pivotably mountedat 3. This lever 2 comprises first or uppermost element 2A, a second ormiddle element 23 and a third or lowermost element 2C fixed rigidlytogether by means of pins 2a and 2b. The first lever element 2Acomprises a first elongated resilient arm 20. In the similar way, thesecond lever element 28 comprises a second elongated resilient arm 2d.The third lever element 2C is provided with a third angular-shaped,rather rigid arm 2e.

An urging spring 4 has a root portion 4a which is fixedly attached tothe base plate 1 by means of pins 10 and 33, an intermediate bentportion 4b which is kept normally in pressure-contact with a shoulder 13formed on the plate 1, and a tip end portion 4c which is kept always inpressure contact with the arm 2 for urging resiliently the latter toturn clockwise in FIG. 1 around its pivot pin 3.

Numeral 5 represents a first cam which is fixedly attached to aconventional seconds hand arbor 6 for return operation of the secondshand, not shown, as will be more fully described hereinafter. There isprovided afsecond cam 7 which is fixedly attached to a conventionalminute hand arbor 8 for return operation of the minute hand, not shown,as will be more fully described hereinafter. The first cam 5 haspreferably a heart cam configuration as shown, while the second cam 7has a generally disc configuration having a relatively large peripheralnotch 7a as a preferred shape shown in FIGS. 1 3. I

A first cam control lever 9, having generallya L- shape when seen inFIGS. 1 and 2, and comprising an elongated, slightly resilient armportion 9c and a root portion 9d made integral therewith, and its rootportion 9d is pivotably mounted on the pin 10, while its arm portion isformed at its tip end with an active surface 9a and a curved recess 9bas shown. When the lever 9 is brought into its operating position, theactive surface 9a is kept in contact with the cam 5, as shown in FIG. 2.Thus, the lever 9 is shown in its regular and nonoperating position inFIG. 1. For this purpose, the first resilient arm 20 is kept in pressurecontact with a projection 9e of the lever 9 which defines partly therecess 9b, thereby the last mentioned lever 9 being normally kept in itsnon-operating position shown in FIG. 1. The extreme position is definedby a stationary stop pin 14 which is studded on the base plate 1.

A second cam control lever 11 is pivotably mounted on the base plate 1at 12. This lever 11 is formed with an operating end 1 la, a curvedrecess 11b and a projection llc, the latter being normally kept inpressure contact with the tip end of the second lever arm 2d of saidlever 2 for keeping the cam control lever 11 in its non-operatingposition shown in FIG. 1. When the lever 11 is brought into itsoperating position, the operating end 11a is kept in physical contactwith the second control cam 7 as shown either in FIG. 2 or 3, as thecase may be. In the non-operating position of the second cam controllever 11, the tip end of the second resilient arm 2d of lever 2 is keptin contact with the projection 110. For defining the extremenon-operating position of the lever 11, there is provided a stationaryshoulder 15 on the base plate 1 for cooperating the lever projection11:.

A conventional minute hand pinion 8a is made rigid with the arbor 8. Aconventional second wheel 16 is loosely mounted on the arbor 8. A seatring 17 is made rigid with the arbor 8 on which the inner periphery of aperforated disc spring 18 abuts, while the latter is kept in pressureengagement by its outer peripheral zone with the second wheel 16, thusthis wheel being resiliently urged axially upwards against second cam 7.

- 3 In this way, a kind of friction clutch isprovided by the combinationof seat 17 and disc spring 18 being the second wheel 16 and the minutehand arbor 8.

Conventional seconds hand pinion 6a is made inte- I gral withthe arbor 6and conventional fourth wheel 6b is arranged rigidly with the same arbor6. Third wheel 19 comprises a third gear 19a and a third pinion 19b maderigid with each other. Third pinion 19b meshes with second wheel 16.Fifth wheel 20 meshes with fourth wheel 6b. Sixth wheel 21 comprises agear 21a and a pinion 21b made rigidwith each other, the sixth pinion21b meshing with said fifth wheel 20. Indexing wheel 22 comprises a gear22a and a pinion 22b made integral with each other; the indexing pinion22b meshing with said'sixth gear 21a, while the indexing gear 22a isadapted for periodical cooperation with a conventional impulse pin 24bmounted on a cam 24a comprised in a drive balance wheel assembly 24.Indexing gear 22a is stepwise positioned magnetically by a stationarypositioning magnet 23 mounted on the base plate 1, when the timepiecemovement goes. For attaining the driving nature, the balance wheelassembly is provided with two pairs of permanent magnets, of which onlya pair is shown schematically at 33 in FIG. 4, arranged to cooperatewith stationary coil means .34 shown only-schematically andpartiallytherein.

Numeral 25 represents a conventional cannon wheel which is rotatablymounted on the minute hand arbor 8 and provided with an hour hand, notshown. Numeral 26'represents a conventional minute wheel having a gear26a and a pinion 26b made rigid therewith. The

minute pinion 26b meshes as conventionally with the cannon wheel 25,while the gear 26a meshes with the minute hand pinion 8a.

Numeral 27 represents abalance stop lever which has a pivot pin 32studded on the base plate 1. This lever 27 is formed integrally withrigid projections 27a, 27b and 27d and with an elongated and resilientarm 270 which is kept in pressure contact with a stop pin 28 studded onthe plate 1. The second projection 27b is kept in pressure engagementwith the rigid arm 2e of the motion-transmitting lever 2 when thebalance stop lever 27 is in its off-service position shown in FIG. 1.

Inthiscase, the lever 27 is subjected resiliently to a clockwise turningeffort accumulated therein around its pivot 32, when freed from contactwith said rigid arm 2e, as clearly seen from comparison of FIG. 1 withFIG; 2. With clockwise pivotal movement of the stop lever 27, the firstprojection 27a thereof is brought into cooperative engagement with stopcam 24a 'whichiis rigidly and concentrically attached on the balancewheel arbor shown at 24c. The clockwise turning movement of the freedstop lever 27 is limited by contact of its third projection 27d. with aland 29 formed integrally on the plate 1. s

' Numeral 30 repr esents schematically and partially a self-containedbattery which feeds currents through a conventional transistored drivecircuit, not shown, to the coil meanst34, although the wiringconnections have been omitted from the drawing only for simplicity.

Numeral 3' represents ,an outside operating member, preferably in theform of push button or reciprocatingly operable stem, such asconventional time-setting stem, arranged for cooperation with one end ofthe motiontransmitting lever 2, although its bearing means and re- 4turn spring have been omitted from the drawing only for simplicity.

The'operation of the first embodiment so far shown and described is asfollows:

It is now assumed that the accurate present time is just 9 hour 0'4)"and the timepiece fitted with the foregoing embodiment displays 9 hour03'20".

When the timepiece user wishing to set his timepiece representation tothe correct time, he depresses push button 3' from its outernon-operating position shown in FIG. 1 to its inner operating positionshown in FIG. 2.

Motion is thus transmitted from push button 3 to lever 2 so that thelatter is turned counter clockwise about its pivot pin 3 in FIG. 1 tooccupy its operating position shown in FIG. 2. By this pivotal movementof the lever 2, motion is further transmitted through its respectivearms 20 and 2d to first and second cam control levers 9 and 11,respectively, so as to turn clockwise these levers from their positionshown in FIG. 1 to that appearing in FIG. 2. At the same time, theresiliently urged balance stop lever 27 is released from contact by itssecond projection 27b with the rigid arm 2e of motion-transmitting lever2 and turns clockwise a certain predetermined angle around its pivot pin32, until its first projection 27a will have been brought into itscooperating position with either projection 24d or 24e of stop cam 24aon the oscillating balance wheel assembly, 24 as was only brieflyreferred to hereinbefore, thereby the latter being positively preventedits oscillating movement and kept stationary. At this stage,conventional hair spring 24f fitted to the balance wheel assembly isheld under tension for ready for quick restarting thereof, and theimpulse pin 24b is held at its nonoperating position relative to itsregularly cooperating indexing gear 22a which is thus freed withoutreceiving any driving torque from the balance wheel assembly.- Inpractice, however, the indexing gear is'kept stationary under theinfluence of attracting magnetism emanating from the positioning magnet23.

With clockwise pivotal movement of first cam control lever 9, its activeend surface 9a is brought into contact with first cam 5, thereby thelatter being forcibly turned to its zero position corresponding to thatof the seconds hand. This position is shown in FIG. 2.

Since such a zero return heart cam mechanism is thereby the latter beingforcibly returned to its zero po sition corresponding to that of theminute hand. At the same time,'the hour hand is returned to its nineo'clock position in this case. Thus, the corresponding time indicationwill be 9.00.

In this case, the ratio in returning angle between the second cam 7 forminute hand and the first cam 5 for seconds hand is 3 20 and thusdifferent from the regular rate 1 60. Therefore, there must be a certainamount of slippage between the minute hand arbor 8 and the seconds handarbor 6. For this purpose, the aforementioned clutch comprising thecombination of seat 17 and disc spring l8 serves well.

Although, in this case, torque is reversedly transmitted from secondshand arbor 6 through fourth wheel 6b, fifth wheel 20, sixth pinion 21b,sixth gear 21a and indexing pinion 22b to indexing gear 22a which willthus be rotated to a certain degree in the reverse direction against thepositioning action of the magnet 23. Thanks to the aforementionedoperative interruption between impulse pin 24b and indexing gear 22a,there is no adverse effect caused thereby.

In the present specific embodiment, the notch 7a is so dimensioned as tocover an adjustable range of :4 minutes, which range may naturally bemodified as occasion desires.

Next, it is assumed that the correct time is 9 hour 0" and the timedisplay of the watch is 9 hour 20'-35".

Under this condition, when the watch user depresses the push button 31as before, both cam control levers 9 and 11 are turned clockwise in thesimilar way. In this case, however, the operating end 110 of second camcontrol lever 11 is brought into contact with the lobe surface of secondcam 7 exclusive of the notch 7a, as shown in FIG. 3, thereby no positiveturning effort being provided thereupon. However, the second arm 2d ofthe motion-transmitting lever 2 is brought into a certain resilientlyflexed position. Practically at the same time, the active surface 90 offirst cam control lever 9 is brought into cooperation contact with thefirst cam 5, as shown in FIG. 3, thereby the cam together with secondshand arbor 6 being turned forcibly and counter clockwise in FIG. 3 anangular range corresponding to or (60' '35), so as to set the secondshand to its zero position. FIG. 3 shows the position of first cam 5corresponding to this newly zero-set one. With such setting rotation ofthe first cam 5, the

second cam 7 will be slightly rotated in the same direction at the ratioof l 60. Since the lobe surface of second cam 7 has been finished highlysmoothly, the operating end 11a of second cam control lever 11 can slidewithout hindrance. Thus, the minute .hand will be moved to the positionof 20'. In this way, the correct time-setting operation has beencompleted in this case. ln this case, the clutch 17-18 will naturallynot slip. The operation of the indexing wheel 22 is as before. lt willbe seen from the foregoing description and by reference to the heart camconfiguration at 5 that B0 seconds error in the time displayrepresentation can be accomplished either in the return or advancingmode, as occasion may desire.

Although in the foregoing description, it has been disclosed forsimplicity that the operations of the first and second cam controllevers 9 and 11 and of the balance stop lever 27 may be brought aboutsubstantially at the same time. However, in practice, it should bementioned that the operation of the balance stop lever 27 must becarried out somewhat earlier than those of the first both levers 9 and11. If not, and thus when the balance wheel assembly 24 is kept in itsregular oscillating position and the indexing wheel 22 should be rotatedfrom the side of the time correction mechanism,

the teeth of the indexing gear 22a could be brought into collision withimpulse pin 24b on stop cam 24a of the balance wheel assembly 24,thereby the wheel teeth and impulse pin being subjected to heavy damage.

It should be further noted that if the second cam control lever 11should be brought into operation earlier than the first cam controllever 9, an unintentional quick rotation of the seconds hand will beinvited by the rotation of the second cam 7, which, when brought about,would give the watch user a highly unpleasant feeling. In order toprevent such operational defect, the related parts are so dimensionedand arranged that only after the first cam control lever 9 has beenbrought into the locus sphere of the first cam 5, the second cam 7 willinitiate its rotational movement for time display correction.

Next, the second embodiment shown only in its essential parts in FIG. 5will be described. It should be noted at this stage that otherconstituent parts than those shown may be same as those of shown in theforegoing first embodiment. Further note that same or similar partsshown as those of the first embodiment have been denoted with respectivesame reference numerals, each being added with for quicker and clearercomparison with the first embodiment.

Numeral represents a first cam attached fixedly to seconds hand arbor106. As seen, this cam 105 has a heart shape as before.

Second cam 107 is attached fixedly to a minute hand arbor, not shown, orto a further arbor, again not shown, operatively connected therewith.Although not shown, there is provided a mechanical clutch means,preferably a friction clutch of known design, between the seconds handarbor 106 and the cam 107. Numerals 109 and 111 represent first andsecond cam control levers, as before, which are shown, however, onlypartially and schematically. The cam 107 is formed with a number ofsuccessive peripheral saw tooth recesses 107b each of the latter havinga peripheral coverage corresponding to a minute, together with a largenotch 107a having similar configuration and function as those of theforegoing notch 7a. When the minute hand is positioned within an offsetrange of :4 minutes relative to a certain correct time, operation of thefirst cam control lever 109 by manipulation of a push button, not shown,similar to the foregoing button 31 will influence upon the first cam 105for correct zero-setting of the seconds hand as described hereinbefore.By operation of the second cam control lever 111, it is brought intoengagement with the notch 107a on the cam 107 for correct setting of theminuteand hour hands as before.

The force received by the first cam 105 for the correction of secondshand from the lever 109 can be released by idle rotation of the indexingwheel as at 22 in the foregoing embodiment. The rotational differencebetween the cams 107 and 105 caused by the both kinds time correctionoperations can be well compensated by the clutch means provided betweenthe arbor 106 and cam 107 in the similar manner as explained in theforegoing first embodiment.

Even when the minute hand is situated outside of the aforementioned :4minutes offset range actuation of the push button corresponding to 31will bring the seconds hand arbor to its correct zero position under theinfluence of the first cam control lever 109 as before. The second camcontrol lever 111 will enter one of the serrated recesses l07b on thecam 107, thereby the minuteand hour hands being corrected to theircorrect position. The hour hand is corrected, since it moves inconjunction with the minute hand. Thus, when the minute hand iscorrected, it moves the hour hand a very small amount. Morespecifically, the aforementioned functional cooperation of the secondcam 107 with first cam 105 will bring all the hour-, minuteand secondshands to their correctly interrelated relative position corresponding asto show the desired correct timedisplay positions.

Although in the foregoing embodiments, the motionreceiving notch 7a or107a has been shown and described as singular, the number of the notchescan be increased to a cetain plural. In this way, when the minute handis situated, as an example, within the range of 30 1 several minutes or45 1'" several minutes, relative to the correct time such as 35 or 45',respectively, it can be set thereto, as will be easily understood fromthe foregoing description.

Referring finally to FIG. 6, the third embodiment will be described indetail. In this embodiment, the invention has been applied to a quartzwrist watch. In this embodiment, same or similar parts as those used inthe first embodiment will be shown by same reference numerals, eachbeing added with 200 for easy comparison and better understanding.

In the present embodiment, the motion converter adapted for conversionof electrical energy into a corresponding mechanical and rotationalmovement has been embodied into a miniatured stepping motor, as will bemore fully hereinbelow. hereinbelow Numeral 206 represents a second handarbor to which a conventional fourth gear 206b and the first or secondshand correction cam 205 which is shaped as before into a heart cam. Thefourth gear 206b is shown only schematically and as partially brokenaway. The miniatured stepping motor is shown at 250, having a stator 251and a rotor 252 magnetically coupled therewith. The rotor is providedwith its shaft 252a rigid therewith and rotatably mounted in suitablebearing means, not shown, which is mounted in turn in base plate 201,preferably conventional pillar plate only partially shown, and a bridgemember, supported rigidly thereon although not shown. The rotor 252further comprises a 6-pole permanent magnet 252b having alternativelyand radially arranged N-and S-poles, a 6- teeth ratchet wheel 2520 forreverse rotation preventing purpose and a pinion 252d. These magnet252b, ratchet wheel 252C and pinion 252d are made rigid with the rotorshaft 252a, said pinion meshing with said fourth gear 206b, asschematically represented.

The stator 251 comprises a pair of oppositely arranged stator halves251a and 25lb rigidly mounted on base plate 201 although their mountingmeans have been omitted only for simplicity. The stator 251 is fittedrigidly with an energizing coil 25lc having its terminals shown at 251dand 25le which are electrically connected with a conventionaltransistored electronic drive circuit of conventional design andincluding a quartz or crystal oscillator, although not shown, for beingfed with a pulsative a.c. current as schematically shown at the lowerleft corner in FIG. 6.

An elongated and resilient spring strip 253 is fixedly mounted with itsroot portion on the base plate 201 by means of a collet 253a which iskept in pressure fit on a stud pin lb studded on the plate 201, whilethe tip end of the strip 253 is kept in engagement with one of the teethof said ratchet 2520, thus the latter being allowed only one waystepping rotation as shown by a small arrow in FIG. 6.

Although not shown, motion-transmitting lever 202, only partially shown,is adapted for performing a piv- 'otal movement substantially in thedirection shown by an arrow alpha when mechanically urged by intentionaldepression of a push button, similar to that shown at 31 in FIGS. 1 and2. The lever 202 is formed with a slot 202a and a projection 202b. Thepivot pin, as at 2b in FIGS. 1 and 2, has been omitted from the drawingonly for simplicity. An urging spring as at 4 in the foregoing has beenomitted only for the same purpose. Normally, the lever 202 is kept inits off-service position shown in FIG. 6.

Seconds hand setting lever 209 is pivotably mounted on the base plate201 by meansof a pivot pin 210 studded thereon, and fitted with amotion-receiving pin 20% which is studded on the setting lever 209 andkept in loose engagement with said slot 202a. Numeral 209a representsthe actuating or operating end of the lever 209;

A further lever 227 is pivotably mounted through its pivot pin 232studded on the base plate 201. A spring bend 227C is inserted betweenthe lever 227 and a land 201a on the plate 201, thus the lever. beingurged to rotate clockwise in FIG. 6 around its pivot pin 232 and keptstationary by contact of its stop pin 227b with the projection 202b ofthe motion-transmitting lever 202. In close proximity to said springstrip 253, an actuating pin 227a is provided on the lever 227. When thislever 202 is rotated clockwise in FIG. 6 about its pivot pin, the pin227a is brought into collision with the spring strip 253 which is thusdisengagement from meshing with the ratchet wheel 252C.

The operation of the last embodiment so far shown and described is asfollows:

When a series of a.c. driving pulses as shown at the lower left cornerof FIG. 6 are fed from the electronic driving circuit, having a crystaloscillator as a time base of the watch, through terminals 251d and 25lcto the energizing coil 2510, thus the stator halves 251a and 251!) beingmagnetized oppositely to each other and in the alternative way.Therefore, the rotor 252 will rotate one step (one-sixth of a completerotation) clockwise in FIG. 6 for every reception of one pulse. Thespring strip 253 serves for prevention of occasionally andunintentionally'caused reverse rotation of the rotor. Further, it actsas a vibration damper for the rotor.

The thus caused stepwise rotation of the rotor ist'ransmittedthrough.pinion 252d and gear 206b to seeonds hand arbor 206,and so on.

When the watch user depresses an actuating member such as the pushbutton as at 31 adopted in the foregoing embodiments,motion-transmitting lever 202 is pivotingly moved as shown by the arrowalpha. At the first stage, the projection 202b collides against the pin227b, thereby the lever 227 being pivoted counter clockwise in FIG. 6for disengaging the spring strip 253 from engagement with ratchet wheel2520.

Since, at this stage, the electric drive pulses are fed to theenergizing coil as regularly, the rotor can continue its steppinglyrotational movement without hindrance. At this stage, the rotor is keptin magnetic coupling with its stator, although the coupled state isvariable. It should be noted that the rotor can be driven in eitherrotational direction, as the case may be, when an appreciable drivingtorque overcoming said magnetic coupling is applied to the rotor.

With further pivotal operation of the lever 202, the seconds handsetting lever 209 is caused, thanks to the pin-and-groove connection20%; 202a, to make a clockwise pivotal movement around its pivot pin 210and its operating end 209a is brought into its cooperating contact withthe cam 205. In this way, the seconds rotor are rotated by gear-meshingbetween gear 2%];

and pinion 252d, and upon overcoming the inherent magnetic couplingwithin the interior of the stopping motor 250, the rotor is corrected inits position relative to the stator. Thus, it will be seen that there isno needs of the provision of clutch means between the seconds hand arbor206 and the motion-conversion mechanism.

In a modification, not shown, the current motionconverter may exclusivea tuning fork, a piezoelectrical drive means or so for oscillative drivethereof, a feed spring pawl (pallet) mounted on said tuning fork, anumber of feeding teeth on a ratchet wheel adapted for engagement withsaid feed pawl, and a stop pawl pallet) adapted for preventing anyreverse motion of the ratchet. Also, in this case, the arrangement is sothat these stopand feed pawls or pallets may be disengaged so as tobring the ratchet wheel into its freely rotatable state for attainingthe same purpose.

The embodiments of the invention in which an exculsive property ofprivilege is claimed are as follows:

1. in an electronic watch comprising:

a. conversion means for converting electrical energy into mechanicalrotational movement;

b. actuation means operable from the outside of the casing of saidwatch;

c. a first arbor for the seconds hand of said watch;

*d. a second arbor for the minute hand of said watch;

e. gear train means coupling said conversion means to said first arbor;

f. clutch means for allowing relative slippage between said two arbors;

g. first cam means, of a heart configuration, fixedly attached to saidfirst arbor;

h. second cam means, of a notched disc configuration, fixedly attachedto said second arbor;

i. motion-transmitting lever means for receiving motion from saidactuation means;

j. a first cam control lever means for receiving motion from saidmotion-transmitting lever means and for cooperating with said first cammeans so as to correct said seconds hand to its zero-position and tocorrect said minute hand to its correct minute indicating position;

k. second cam control lever means for receiving motion from saidmotion-transmitting lever means and for engaging the notch of saidsecond cam means for correcting said minute hand to its zero-position;

l. lever means responsive to said motion from said motion-transmittingmeans, thereby stopping said conversion means in its operation and fordisconnecting said train means; and,

m. a resilient means, provided in the path of motion transmissionextending from said actuating means to said second cam control levermeans, for correcting only said first cam in its position when saidsecond cam control lever means engages said second cam at any positionother than said notch.

2. An electronic watch such as claimed in claim 1, wherein saidmotion-transmitting lever means comprises a first and second resilientarm held in pressure engagement with said first and said second camcontrol lever, respectively.

3. An electronic watch such as set forth in claim 2 wherein said motionconverting means comprises a drive balance wheel and an index wheel heldin cooperation therewith, wherein said lever means for stopping saidmotion conversion means and for decoupling said motion conversion meansfrom the gear train, said first cam control lever means and said secondcam control lever means are sequentially operated by actuating saidactuation means.

4. An electronic watch such as set forth in claim 3, further comprisinga series of serrations formed on the periphery of said second cam forcorrecting said second arbor to the correct minute position.

1. In an electronic watch comprising: a. conversion means for convertingelectrical energy into mechanical rotational movement; b. actuationmeans operable from the outside of the casing of said watch; c. a firstarbor for the seconds hand of said watch; d. a second arbor for theminute hand of said watch; e. gear train means coupling said conversionmeans to said first arbor; f. clutch means for allowing relativeslippage between said two arbors; g. first cam means, of a heartconfiguration, fixedly attached to said first arbor; h. second cammeans, of a notched disc configuration, fixedly attached to said secondarbor; i. motion-transmitting lever means for receiving motion from saidactuation means; j. a first cam control lever means for receiving motionfrom said motion-transmitting lever means and for cooperating with saidfirst cam means so as to correct said seconds hand to its zero-positionand to correct said minUte hand to its correct minute indicatingposition; k. second cam control lever means for receiving motion fromsaid motion-transmitting lever means and for engaging the notch of saidsecond cam means for correcting said minute hand to its zero-position;l. lever means responsive to said motion from said motiontransmittingmeans, thereby stopping said conversion means in its operation and fordisconnecting said train means; and, m. a resilient means, provided inthe path of motion transmission extending from said actuating means tosaid second cam control lever means, for correcting only said first camin its position when said second cam control lever means engages saidsecond cam at any position other than said notch.
 2. An electronic watchsuch as claimed in claim 1, wherein said motion-transmitting lever meanscomprises a first and second resilient arm held in pressure engagementwith said first and said second cam control lever, respectively.
 3. Anelectronic watch such as set forth in claim 2 wherein said motionconverting means comprises a drive balance wheel and an index wheel heldin cooperation therewith, wherein said lever means for stopping saidmotion conversion means and for decoupling said motion conversion meansfrom the gear train, said first cam control lever means and said secondcam control lever means are sequentially operated by actuating saidactuation means.
 4. An electronic watch such as set forth in claim 3,further comprising a series of serrations formed on the periphery ofsaid second cam for correcting said second arbor to the correct minuteposition.